Climbers bloom from vertical shoots. To increase the bloom, you want
the main branches to be horizontal. They will then produce more
vertical side shoots. The longer the horizontal main branches, the more
vertical side shoots.
See my <http://www.rossde.com/garden/garden_rosepruning.html . This is
more about the philosophy and approach to pruning roses than it is about
the technique.

I've got climbing roses. They can get out of hand without proper
pruning. What you want to avoid is a "canopy" type of cover which
shades the plant underneath and promotes excessive moisture (black
spot fungus). First, I remove all dead canes or canes that are
thinner than a pencil diameter. Too many canes close together are
not good either--I select the best and prune out the others. Proper
pruning will produce a better, stronger plant.

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